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Akka/Scala example source code file (PersistentViewExample.java)
The PersistentViewExample.java Akka example source codepackage sample.persistence; import akka.actor.ActorRef; import akka.actor.ActorSystem; import akka.actor.Props; import akka.japi.Procedure; import akka.persistence.SnapshotOffer; import akka.persistence.UntypedPersistentActor; import akka.persistence.UntypedPersistentView; import scala.concurrent.duration.Duration; import java.util.concurrent.TimeUnit; public class PersistentViewExample { public static class ExamplePersistentActor extends UntypedPersistentActor { @Override public String persistenceId() { return "sample-id-4"; } private int count = 1; @Override public void onReceiveRecover(Object message) { if (message instanceof String) { count += 1; } else { unhandled(message); } } @Override public void onReceiveCommand(Object message) { if (message instanceof String) { String s = (String) message; System.out.println(String.format("persistentActor received %s (nr = %d)", s, count)); persist(s + count, new Procedure<String>() { public void apply(String evt) { count += 1; } }); } else { unhandled(message); } } } public static class ExampleView extends UntypedPersistentView { private int numReplicated = 0; @Override public String persistenceId() { return "sample-id-4"; } @Override public String viewId() { return "sample-view-id-4"; } @Override public void onReceive(Object message) throws Exception { if (isPersistent()) { numReplicated += 1; System.out.println(String.format("view received %s (num replicated = %d)", message, numReplicated)); } else if (message instanceof SnapshotOffer) { SnapshotOffer so = (SnapshotOffer)message; numReplicated = (Integer)so.snapshot(); System.out.println(String.format("view received snapshot offer %s (metadata = %s)", numReplicated, so.metadata())); } else if (message.equals("snap")) { saveSnapshot(numReplicated); } else { unhandled(message); } } } public static void main(String... args) throws Exception { final ActorSystem system = ActorSystem.create("example"); final ActorRef persistentActor = system.actorOf(Props.create(ExamplePersistentActor.class)); final ActorRef view = system.actorOf(Props.create(ExampleView.class)); system.scheduler().schedule(Duration.Zero(), Duration.create(2, TimeUnit.SECONDS), persistentActor, "scheduled", system.dispatcher(), null); system.scheduler().schedule(Duration.Zero(), Duration.create(5, TimeUnit.SECONDS), view, "snap", system.dispatcher(), null); } } Other Akka source code examplesHere is a short list of links related to this Akka PersistentViewExample.java source code file: |
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